Updating ose-cluster-kube-apiserver-operator builder & base images to…

… be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/ac81dd4ff0bd57c4e75058d25b40615b92948259/images/ose-cluster-kube-apiserver-operator.yml

Dockerfile.rhel7

@@ -1,10 +1,10 @@
-FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.6 AS builder
+FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
 WORKDIR /go/src/github.com/openshift/cluster-kube-apiserver-operator
 COPY . .
 ENV GO_PACKAGE github.com/openshift/cluster-kube-apiserver-operator
 RUN make build --warn-undefined-variables
 
-FROM registry.svc.ci.openshift.org/ocp/4.6:base
+FROM registry.svc.ci.openshift.org/ocp/4.7:base
 COPY --from=builder /go/src/github.com/openshift/cluster-kube-apiserver-operator/bindata/bootkube/bootstrap-manifests /usr/share/bootkube/manifests/bootstrap-manifests/
 COPY --from=builder /go/src/github.com/openshift/cluster-kube-apiserver-operator/bindata/bootkube/config /usr/share/bootkube/manifests/config/
 COPY --from=builder /go/src/github.com/openshift/cluster-kube-apiserver-operator/bindata/bootkube/manifests /usr/share/bootkube/manifests/manifests/